How do I allow PNG's in my crop script? - php

Question

I've got an upload function that allows both Jpegs and PNG's. After the image is uploaded, a php file is called that handles a crop function to crop the uploaded image.
After the image is cropped, it is once again saved to the server under a new name. In this current setup, only jpegs are able to be written to the server. Anything else will draw a black image.
I was wondering How I write this code so that the crop also allows PNG's
The code that handles the crop:
$imageLocation = $_SESSION['image_location'];
$newNameOverwrite = $_SESSION['new_name'];
if ($_SERVER['REQUEST_METHOD'] == 'POST')
{
$jpeg_quality = 100;
$src = $imageLocation;
list($width, $height, $type, $attr) = getimagesize($src);
$targ_w = $width;
$targ_h = $height;
$img_r = imagecreatefromjpeg($src);
$dst_r = imagecreatetruecolor($_POST[('w')], $_POST[('h')]);
$uploadLocation = 'uploads/';
$name = $uploadLocation.'resized_'.$newNameOverwrite;
imagecopy(
$dst_r, $img_r,
0, 0, $_POST['x'], $_POST['y'],
$_POST['w'], $_POST['h']
);
imagejpeg($dst_r,$name,100);
$imageCropped = $name;
$_SESSION['image_cropped'] = $imageCropped;
//Thumbnail generate
include('SimpleImage.php');
$imageThumbnail = new SimpleImage();
$imageThumbnail->load($name);
$imageThumbnail->resizeToWidth(200);
$imageThumbnail->save($uploadLocation.'resizedThumbnail_'.$newNameOverwrite);
$imageThumbnailCropped = ($uploadLocation.'resizedThumbnail_'.$newNameOverwrite);
$imageThumbnailCroppedSession = $imageThumbnailCropped;
$_SESSION['image_cropped_thumbnail'] = $imageThumbnailCroppedSession;
}
Updated code:
$imageType = $_SESSION['image_type'];
if ($_SERVER['REQUEST_METHOD'] == 'POST')
{
$jpeg_quality = 100;
$src = $imageLocation;
list($width, $height, $type, $attr) = getimagesize($src);
$targ_w = $width;
$targ_h = $height;
if ($imageType == '.jpg' || $imageType == '.jpeg'){
$img_r = imagecreatefromjpeg($src);
}
if ($imageType == '.png'){
$img_r = imagecreatefrompng($src);
}
$dst_r = imagecreatetruecolor($_POST[('w')], $_POST[('h')]);
$uploadLocation = 'uploads/';
$name = $uploadLocation.'resized_'.$newNameOverwrite;
imagecopy(
$dst_r, $img_r,
0, 0, $_POST['x'], $_POST['y'],
$_POST['w'], $_POST['h']
);
var_dump($imageType);
if ($imageType == '.png'){
imagepng($dst_r,$name);
}
if ($imageType == '.jpg' || $imageType == '.jpeg'){
imagejpeg($dst_r,$name, 100);
}
$imageCropped = $name;
$_SESSION['image_cropped'] = $imageCropped;
include('SimpleImage.php');
$imageThumbnail = new SimpleImage();
$imageThumbnail->load($name);
$imageThumbnail->resizeToWidth(200);
$imageThumbnail->save($uploadLocation.'resizedThumbnail_'.$newNameOverwrite);
$imageThumbnailCropped = ($uploadLocation.'resizedThumbnail_'.$newNameOverwrite);
$imageThumbnailCroppedSession = $imageThumbnailCropped;
$_SESSION['image_cropped_thumbnail'] = $imageThumbnailCroppedSession;
}

Answer 1

Use PHP to determine what type of image it is, then dynamically use *_png functions instead of *_jpeg ones. IE, instead of imagecreatefromjpeg use imagecreatefrompng